Sewing-machine motor.



PATENTED JUNE 6, 1905.

H. J. YOUNG.

SEWING MACHINE MOTOR.

APPLICATION FILED FEB.20,1904.

2 SHEETS-SHEET 1.

N V WV/PW @N M.

No. 791.528. PATENTED JUNE 6, 1905.

H. J. YOUNG.

SEWING MACHINE MOTOR.

APPLICATION FILED PEB.20,1904'.

2 SHEETSSHBET 2.

UNTTED STATES Patented June 6, 1905..

HOMER J. YOUNG, OF TOLEDO, OHIO.

SEWING-MACHINE MOTOR.

SPECIFICATION forming part of Letters Patent No. 791,528, dated June 6,1905.

Application filed February 20, 1904. Serial No. 194,567.

To all whom, it nan/y concern:

Be it known that I, HOMER J. YOUNG, a resident of Toledo, in the countyof Lucas and State of Ohio, have invented certain new and usefulImprovements in Sewing-Machine Motors, of which the following isaspecification. This invention relates to improvements in sewing-machinemotors, and has reference more particularly to an electric motordesigned for application to many of the sewingmachines now in common usewithout reconstructing or substantially changing the machines, beingtherefore in the nature of an attachment.

Among the salient objects of the present invention are to so constructand arrange the motor that in general form it resembles the ordinaryhand-wheel of the sewing-machine head and is used in lieu of the latterby the operator, the motor being to this end so designed that theexternal member is the rotating member; to provide at the same time aconstruction which is extremely compact and fully housed against thepossibility of injuring the operator by careless handling of the same;to provide a construction which may be almost instantly and with thegreatest convenience entirely detached from the sewingmachine head; toprovide means for holding the non-rotative member of the motor fixedagainst rotation by the use of a simple springclamp, which adapts itselfto the arm of the machine and may be applied and withdrawn from thelatter without involving the use of mechanical fastenings; to provide aconstruction which permits of the use of roller-bearings between thefixed and rotative members without sacrificing accuracy of adjustmentand movement of the parts relatively to each other; to provide aconstruction in which the rotating member becomes a support for thefield or stationary member, thereby dispensing with any support externalto the motor other than some means for merely holding the stationarymember from rotating, and in general to provide improved details ofconstruction and arrangement in a motor of the character referred to.

the matters hereinafter described, and more particularly pointed out inthe appended claims.

The invention will be readily understood from the following description,reference being had to the accompanying drawings, forming a partthereof, and in which Figure 1 is a side elevation of the complete motorapplied to the main shaft of a sewingmachine head. Fig. 2 is an axialsectional view taken on the two different radii indicated by theindirect dotted line 2 2 on Fig. 4. Fig. 3 is an end elevation of partsshown in Fig. 1. Fig. L is an inside or face elevation of the motorremoved from the main shaft, the easing or outer shell of the motorbeing omitted. Fig. 5 is a.view of the field member removed from thearmature-ring and viewed from the opposite side to that shown in Fig.4.. Fig. 6 is a transverse sectional view taken on line 6 6 of Fig. 5.Figs. '7, 8, and 9 are details of the extension-sleeve and cooperatingfrictionclutch.

Referring to the drawings, 1 designates as a whole the main shaft of asewing-machine head, upon which is mounted and keyed against rotation anextension-sleeve 2, the latter being in the present instance heldagainst rotation by means of a set-screw 3. The extension-sleeve-isprovided at its inner end with an annular enlargement 4, the outer faceof which forms a shoulder 5. Upon the extension-sleeve and fittingagainst said shoulder is mounted the main frame member 6 of the motor,which is so constructed as to support practically the entire motormechanism and at the same time substantially inclose the latter. To thisend said frame member com prises a central sleeve member 7 which fitsaccurately upon the extension-sleeve and is approximately coincident inlength with the latter, a skeleton outer face 8, and an integralperipheral rim 9.

In order to lock the main frame member rigidly upon the extension-sleeveor release it, so that it may rotate freely thereon, a friction-clutchmechanism is provided, comprising, as best shown in detail Figs. 7, 8,

To the above ends the invention consists in l and 9, a hand-nut or screw9, threaded to fit the interior of the end of the extension-sleeve llatter, and the inner margins of said pole- 2, and an interposedstop-washer 10, provided with lugs 11, which engagecorrespondinglyformed recesses 12, formed in the end of theextension-sleeve. The hand-nut 9 has a relatively large and flat, head,through the peripheral portion of which is inserted a stopscrew 13,which is adapted to cooperate with a stop-lug 14, formed upon theperiphery of the washer 10. The relative construction and arrangement ofthe parts is such that when the hand-nut is screwed home the sleeve 7 ofthe main frame member is clamped between the shoulder 5 and the innerface of the hand-nut, the stop-washer 10 being interposed between theseparts. After the hand-nut has been adjusted so as to hold the partsrigidly together the stop-screw 13 is inserted and thereafter preventsthe hand-nut from being rotated more than a part of a revolution, apartial rotation of the hand-nut being sufficient in all instances toloosen the clutch and permit the motor to rotate upon theextension-sleeve.

Next describing the construction of the motor proper, 15 designates as awhole the commutator-ring, comprising the usual insulated segmentsseparated from each other and seated in a ring of insulating material16, said commutator-ring being fitted accurately upon the exterior ofthe sleeve member 7 of the main frame and held in position and againstrotation by means of a clamping-ring 17, threaded upon the end of saidsleeve. The outer face of the ring 17 is grooved to form a ball-race 18,within which is arranged a set of balls 19, and upon these is mountedthe field member of the motor, (designated as a whole 20.) Said fieldmember comprises an inner annulus of two-part construction comprising amain member 21, provided with an inner extension 22,

forming one member of a ball-race and internally threaded, as indicatedat 23, to receive the other member, 24. The member 24 constitutes thecone or adjustable ball -confining ring.

The member 21 is provided with pole extensionstwo in the presentinstancearranged at diametrically opposite points and designated 25.(See Eigs. 4 and 5.) Upon the ends of these extensions are mounted thepolepieces proper, 26, which, as clearly shown in Figs. 4 and 5, areperipherally extended, so as to provide fields of considerable angularwidth. The field-windings 27 surround the pole extensions 25, as shownclearly in the drawings.

34 designates the several coils of the armature, which are separated bywasher-like polepieces 35. The pole-pieces 35 are constructed to fitaccurately and closely upon the body of the ring 28, so that they formwhen in position practically integral extensions of the pieces areformed as nearly flush or coincident with the inner surfaces of thecoils 34 as practicable in order that the field pole-pieces 26 mayapproach as closely to the iron of the armature as practicable. Thearmature-ring as a whole is secured to the main frame by means of screwsor screw boltsinserted through the outer face of said frame and throughthe contained armature-ring, as indicated clearly in Fig. 2, the samesecuringscrews being employed to hold in position a casing-plate 9,,which forms a detachable inward extension of the rim 9.

Describing next the construction and arrangement of the commutator-brushes, and referring to Fig. 2, 36 designates a pair of tubular casings ofinsulating material seated in radially-extending and oppositely disposedapertures 37, formed in the member 21 of the field. Within said casingsare mounted to slide carbon brushes 38, which engage at their inner endsthe commutator and at their opposite ends are provided with stems 39,which extend out through keyhole-shaped apertures in the otherwiseclosed ends of the casings. Between the ends of the brushes and theouter ends of the casings are interposed expansion-springs41, whichnormally hold the brushes in yielding contact with the commutator. Inorder that the brushes may be retracted and locked in retractedposition, each stem 39 is provided with a cross-pin 42, adapted to workthrough the keyholes 40 and to hold the brushes retracted when drawnoutside of the casing and turned transversely of said keyholes.Lead-conductors 43 are shown connected to the stems of the brushes 39,although it will be obvious that said leads might be connected to thecoils of the springs 41, if preferred.

The field member of the motor is held against rotation by means of thespring-clamp 44, consisting of a pair of spring-arms formed integrallywith each other and connected with the annulus of the field member, asindicated at 45, said arms being shown as extending radially andslightly divergently outward beyond the periphery of the motor andterminating in right-angled extensions 46, adapted to embrace theopposite sides of the standard of the machine-head, as shown clearly inFig. 1. In order to avoid disfiguring the standard, the extensions 46are desirably provided with rubber protectors 47.

The assembling and operation of the device have been fully indicated inconnection with the description of the construction and need not,therefore, be repeated. It may be noted, however, that the constructionand arrangement of the device is such that the operator may use themotor as a hand-wheel for stopping and starting the machine in preciselythe v same manner as though it were, in fact, a handwheel, and this is afeature of much importance, inasmuch as it entirely dispenses with thenecessity of any braking mechanism. It will be noted also that with theconstruction described I fully attain all of the objects hereinbeforespecified and provide at the same time an extremely compact, cheaplyconstructed, and efficient motor.

I claim as my invention 1. In combination with a drive-shaft, anelectric motor comprising a rotor mounted concentrically upon the shaftand having driving connection with the latter, a stator mountedconcentrically within the rotor and supported by the latter, and meansfor holding the stator against rotation.

2. In combination with a drive-shaft, an electric motor comprising arotor mounted concentrically upon the shaft and having drivingconnection with the latter, a journal rigid with the rotor and arrangedconcentrically within the latter, a stator mounted upon said journalconcentrically within said rotor, and means for holding the statoragainst rotation.

3. In combination with a drive-shaft, an electric motor comprising arotor mounted concentrically upon the shaft, a clutch mechanism foroperatively engagingand disengaging said rotor with and from saiddrive-shaft, a journal rigid with the rotor and arranged concentricallywithin the latter, a stator mounted upon said journal concentricallywithin said rotor, and means for holding the stator against rotation.

4c. In combination with a sewing-machine head and the actuating-shaftthereof, an electric motor comprising a main frame member having acentral journal-sleeve mounted upon said drive-shaft, aradially-extending portion and an armature mounted upon the peripl eralportion of said main frame, a field member mounted concentrically withinsaid armature and journaled upon the journal-sleeve of the main frame,and means for holding said field member against rotation.

5. In combination with the driveshaft of a sewing-machine head, anextension-sleeve rigidly mounted upon the end of said shaft, a mainframe provided with a central sleeve rotatably mounted upon saidextension-sleeve, a friction-clutch for operatively connecting saidextension-sleeve and main frame, an armature mounted upon the peripheryof said main frame, a field member journaled upon the exterior of thecentral sleeve of the main frame and concentrically within saidarmature, and a holding-arm connected with the field member anddetaehably connected with a stationary part of the machine-head.

6. In asewing-machine motor, the combination of an extension-sleeveprovided at one end w ith an external shoulder and internally threadedat its opposite end, a hand-nut having screw-threaded engagement withthe interior of said extension-sleeve, a motor-frame member providedwith a central sleeve mounted upon the exterior of said extension-sleeveand adapted to be frictionally locked to the latter by means of saidhand-nut, a set of commutator-segments mounted upon the exterior of thesleeve member of the motor-frame, a clamping-ring threaded upon theexterior of said sleeve adjacent to the commutator-segments. a ball-raceformed in the exterior of said clamping-ring, a field member providedwith an inwardly-facing ball-race arranged concentrically with andaround said clampingring, a set of balls interposed between the fieldmember and clamping-ring, and an armature rigidly mounted upon theperiphery of said motor-frame member, substantially as described.

7. In a sewing-machine motor, the combination of a main motor-framemember provided with a concentrically-disposed sleeve, aradially-extending casing member and a smooth peripheral rim, anarmaturering rigidly mounted concentrically within said rim, afieldmember journaled upon the exterior of the sleeve of the main framemember concentrically within the armature-ring, a set ofcommutator-segments mounted upon the exterior of said frame-membersleeve, commutatorbrushes mounted upon the field member extendingradially inward and engaging said commutator-segments, means foroperatively connecting said main frame member with the drive-shaft, andmeans for holding the field member against rotation.

8. In an electric motor, a friction-clutch mechanism comprising arelatively fixed sleeve, a motor member journaled upon said sleeve, aclamping-nut having screw-threaded engagement with one end of the sleeveand adapted to clamp the motor member to the sleeve, astop-washerinterposed between said clamping-nut and the clamping motormember, means connecting said washer in non-rotative engagement withsaid sleeve, a stop projection upon said washer and a cooperating stopprojection upon the clamping-nut, substantially as described.

9. In combination with the drive-shaft of a sewingmachine head, anextension sleeve mounted upon said shaft, a motor member mounted uponthe exterior of said sleeve, a clamping-nut threaded into the end of thesaid sleeve and adapted to clamp said motor member rigidly with thesleeve, a stop-washer interposed between the clamping-nut and motormember, provided with one or morelugs engaging corresponding recesses inthe end of the extension-sleeve, a stop projection upon the periphery ofsaid washer, and a stop-pin threaded through the clamping-nut andprojecting IIO into the path of the stop projection of the Washer,substantially as described.

10. In combination with a sewing-machine head and the drive-shaftthereof, an electric motor mounted upon said drive-shaft and having aninner stator member and an outer rotor member and a yoke for holdingsaid stator against rotation comprising a pair of springarms connectedWith the stator member extending radially therefrom and embracing op- I0posite sides of the adjacent standard of the machine-head.

HOMER J. YOUNG.

Witnesses:

ALBERT H. GRAVES, FREDERICK C. GooDwIN.

